Fastening device



Y FASTENING DEVICE l1mm: Feb. 2o. 1942 s sheets-sheet 1 Mal z5 14 70 -F/TZ VON OPEL'.

' mmvrm vA'p'il' 17, 1945. e. 5J @ELM l 2,313,722'

FASTENING DEVICE Filedv Feb'. zo, 1942 s sh@'QQ-sheet 2 i l v I '8- i v *Q bo 41 4o '39 I|353A 72 j u 53j 59 INVENTOR FP1 r2'A VQ/v opa y A Tja/wey FASTENING DEVICE Filed Feb. 2o, 1942 's sneetrsfsneee 1:5

Awa-17,1945 F. voN OPEL 'Y' .2,373,722 if. l

27e. e7- 0 7 l l 93 90 181028934 19 '91 4 A TTO/'QNEY of the typev concerned which eng position, and also Patented Api. 17, 194s FASTENING DEVICE f Frm van opel, New York. N. Y.; "ma mme Alien Property Custodian appncauonretmy zo, 1942, serial No. 431,625

19 claims. (ciu- 221) v 'I'l'iis invention relates to fastenings, in particular removable fastenings to join two or more objects which are substantially fiat at the joint, such'as, e. g., plates or sheets of metal, laminated material, and the like, through substantially registering' holes in them of equal or different sizes.

In particular the invention relates to removable 4fastenings for connecting a cover of any suitable shape with another object, such as, e. g., a cowlficeof another hollow body, such as, e.g., a part of a wing or fuselage of an aircraft or the body of' a vehicle.

More specifically the invention is concerned ',with removable fastenings for joining in a lapjoint, two or more fiat objects, such as, e. g., plates or sheets of meta1. laminated plastic material, and the like', which are accessible only from one Side. j It is an object of the invention to simplify'the manufacture of the elements and ytheir mounting used for `fajstenings of this type. It is another object of the invention to use'shapes for .the elements of the fastening which can be'easily lpro-- duced in inexpensive mass. production. and

. mounted in holes of regular shape, such as round shape.

It is a further object of the inventionto use in ing with the edge of a man holeor filling-in ori- 10 fastenings of this type anA intermediary member comprising a springyportion engaged by the fastener proper, which can' be easily manufactured in lmass productionand equally easily another one.

It`is'stil1 a further object of the invention to use a member in fastenings of the type herein position and, if desired.l even toprevent any unlocking without destroying the joint.

These and other objects of the invention will be more clearly understood-when the specication proceeds with reference to the drawings. I In `the drawings, Fig. 1 shows in cross sectionand partly in elevation a joint incorporating the with me fastener m its locking position the same mounted in a.. hole of the object to be joined to member or of the object in lwhich the member is mounted.

It is still another object of the invention to provide an intermediary member-for a fastening ages'the shank of the fastener in such a manner as to retainit in place and prevent its 4loss before or during assembly of the joint. f

It is still a further object of the invention to use in fastenings of the type concerned an intermediary member which, is springy at the place where it is engaged by the fastenerin its locking shaped for securing the fastenerin its locking invention, Fig. 2 a. plan view of the joint taken from its vaccessible lower side, with part of the head ofthe fastener broken away. Fig. 3 a plan view of the joint taken from its inaccessiblel side as shown in Fig. l, Fig. 4 a cross section along lines 4`4-in Fig. 3, Fig. 5 i\n elevation a fastener. Fig. 6 in elevation and partly in cross section' a modiiication of the fastener, Fig. 7 in cross section and partly in elevation a joint incorporating another feature of the inventionMFig. 8 a cross. section along line 8'8 in Fig. '7, Fig. Saperspectiveview of a fastener used in the feature according to Figs. 7 and 8, Figs. 10.and 11 plan views from above and Figs. 10a and 11a cross sections along lines loa-. Na and 11 of an intermediary member and its connection with one of the objects t'ob'e joined, Figs. 12'and 13 cross sections of other features of an intermediary member and one of the objects in which it is mounted,- Fig. 14 aview from below (or the .inaccessible side) and Fig. 15 a cross section along line I 5- I5 in Fig. 14 of a. modication of the rst described feature of the invention, Fig. 16 in plan' view from the inaccessible side and Fig. 17 in cross section along line .l1-l1 in Fig. 16 of still another modication' of the rst described feature, Fig. 18 in cross lsection and Fig. 1'9,in'plan view and partly in cross section taken along line I ,parts shown` in elevation two modifications of the feature of the invention shown in Figs. 18, 19.

Referringto the exempliflcations of the invention in Figs. 1 to 6, it will be seen that a. fastener is used consisting of head l1 preferably of buttonprovided with means or is Y like shape-provided with a kerf I8, and shank I9. The shank may be solid or, in order to reduce its wemht, hollow as illustrated in Fig. 1. v.M the free end of shank i9, projectionsor studs 2 0 arearranged which extend preferably to diametrically opposite sidesand are preferably integral with the shank. as shown in Fig. 1.

meobjets Alo and u t6 be joined by the fastener in a lap-joint, are illustrated as plates or.

sheets of gmetal, such as aluminum or'aluminum alloy 'of any suitable composition. Holes I2 and IIa- I la in Figs. 10 and- 22 are provided respectively in plates I0 and Il hole I2 'is of larger diameter than hole 22.

A dish-like member 10 having a spring center portion I4, is forcibly fitted into hole I2. To this end, the side wall I8 o'f`member 10 is so dimensioned that its outer surface either snugly fits into hole I2 or its outer diameter very slightly exceeds the inner diameter of hole I2. If wall I6 ts freely into hole I2, member 10,can be secured in the hole by rolling or re'aming wall I6 against the edge of hole l2. Flange l of member llijrests on the outer surface I3 of plate I0 when member 10 is driven into place.

Member may be made of laminated material or sheet metal, particularly steel of a thickness, e. g., of about 116 to nl, of an inch, depending on the dimensions of hole I2 and the load on the fastening and in any event its center portion I 4 is thin enough and/or so treated that it is sprin'gy for the purpose of the invention. It is understood that dish-llike metallic members as described canl easily be manufactured in inexpensive `mass production, e.v g., by punching the member from a sheet and preferably simultaneously dishing it,

i or molding laminated material. A fastener as asvavaa The dimensionsof the fastener are such that shown in the drawings can also easily be made in i mass production, e. g., by casting, drop-forging or the like and subsequent machining of any suitable metal, in particular-aluminum or aluminum v alloy of any suitable composition,

Member 10 is provided with a center hole 24 and communicating slots 23 on opposite sides. In the same way, hole 22 in plate II extends into slots 2| on opposite sides, and both the holes 22, 24 and slots 2I`, 23 are so dimensioned that shank 1 I9 of the fastener with studs 20 .can be passed through them with suilicient clearance when properly aligned. j

The center portion I4 of the. dish-like member isprovided with .hills 25 and dales 26 distantfrom `slots 23,-preferably in such a manner that the dales 26 are olf-set against the slots 23 by about 90. On the side'of each dale 26 opposite to `hill 25, a hill 21 of any desired shape is provided which projects upwardly to a greater extent than hill 25 and thereby forms a kind of stop. It will be appreciated that in punching and pressing to shape the dish-like member, also the hills and dales can be pressed int the sheet, particularly if hot pressing be applied and the springy condition of the .center portion restored, if necessary, by subsequent quenching.

It may be supposed that plate II) forms the outer wall of a hollow body such as a wing of an airplane or body of a vehicle and wall II `forms the edge `of a cover or cowling to begremovably attached to wall .III on its accessible outside I3;

Before assembling' the hollow body, holes I2 are drilled or punched into wall I0 at predetermined places and into each of them adish-like member 10 is driven ormounted. The cover or cowling with holes 24 and slots 23 punched in is positioned upon the outsidey I3 of plate I6 so that one each of the holes 22 therein registers with a hole' I2 each in plate I6 and slots 23 in each dish-likev member register withV the slots 2l' of the aligned j hole in plate' II. Thereupona'fastener is in-,-

its grip, i. e., the distance between adjacent surface portions of the projections 20 and the head I1 is preferably slightly smaller than the distance of the outer surface of center portion 'i4 (supporting vstuds 20) from .the outer surface i3 of plate II, so that the studs 20 in their fas-I to be turned in clockwise direction whereby projections 20 press down the hills'25 'and glide over them until a position is reached in which the projections 2 6 register with slots 23 (and 2|) in this position the fastener falls down or can bewithdrawn; l

It will be appreciated that it depends primarily on the slope of hill 25 towards dale 26 and also upon the shape of the latter whether or not the projections 20 can beremoved from the dales after they once entered. them.- If the slope.is gradual and the dale not too deep, unfastening due to shocks can be securely prevented but is possible if due force is applied to turn the fastener. If the slope fis steep, even forciblev turning ofl the projections 2n out ofthe dales 26 can be prevented and in such case, permanent fastening is accomplished.

By 4making head lI1 as fiat as possible its air resistance can be reduced to any desired extent. The same PUIDOSecan also be served by properly ,rounding the outer surface of the head In order to facilitate moving the projections 20 over the hills 26 of the center portion of the dish-like member, particularly when 4frequent fastening and unfastening in operation is to be effected, the projections may be composed of shaft-like portions 23, Fig. 6, preferably integral with shank I9,"and sleeves 29 thereon, made for instanceof'a self-lubricating bearing material, such as a porous metal composition the pores of which are' either soaked with oil or permanently filled with graphite. VSleeves 29 may snugly ilt upon lprojections 28 or be capable of revolving around them.

In Figs. 7 to 9 another feature of the inven- `tion is illustrated in which it is assumedithat the' objects or plates 301,' 3l, are accessible only from the side SII-and plate 30 forms for instance the edge of acowling and plate 3l the wall of a dish-like member 12 consists substantially of a hollow body. In this feature of the invention, the

springycenter portionv 39, an -approximately cylindrical sidewall 49 land a flange 4I,` and is tom. 1, it was assumed that the disp-like memy ber is fitted into a plate which is not accessible. 'A center hole 44 incenfer portion 39-communicates with'siots 43 extending to opposite sides.

l Plate 3| is provided with a c enter hole 33 communicatingwith slots 42 on opposite sides .in ueiieof;v the slots both in the member and in plate 3I are in alignmentwhen plates. 3ll, 3| are positioned Joint l .Therastener proper consists of a flat head 34 one upon the other`` for effecting' the lpositioned upon cated 55 with kerf 35, shank and projections 31 prefl berjntoplace, fits erably integral withit and extending to opposite sides. As to be seen particularly smoothly rounded projections` or keys 38 are provided on the lower surface of head 34, the upper of flange 4I.

In assembling the joint, plate 30 is properly plate 3l so -that holes 44 and 33 as wellas slots 42, 43 are aligned, the fastener .is inserted from the accessible side SII and its projections 31 passed through the registering 35, pressure exerted upon it so that the springt'v 'the Slots slots 43, 42. A tool is then inserted into kerf center portion 39v yields and projections 31 can be turned over the lower inaccessible..-surface of plate 3l. After the fastener has thus been turned by about .90 in one or the keys 33 come intofalignment with and drop into 43 whereby the springy center portion 39 is somewhat though not entirely released. As a result, the objects 30, 3| are joined by the fastener as well as'friction caused between them from Fig. 9,

other direction, the

r For similar purposes the surface of which is preferably flush with that- :dove-tailed in A the truncated hole 51. Inthis nas'e also wall 56 should be somewhat resilient. 4The slopes of the truncated wall and Ahole are exaggerated in Fig. 12 for better illustrating them. hole 59, Fig. 13, maybe a dish-like member .be' shaped correspondingly,

^ operation; in such -in' the dish-like member, the same whereby the member` is tightly heldin place and alsoI an additional seat Aprovided to that formed `rl therein differs from that shown in Figs. -1 to 4 lin that the springy center portion I9 of the dishby the elastic strain produced in the springy center portion 39; the fastener is locked in its position by the keys 38 engaging the slots 43. Un"

locking can be effected by returning the fastener in its initial position by means of a tool inserted in-kerf 35. It will be appreciated, however, that by shaping the keys 38 differently than shown in Fig. 9, particularly giving them a rectangular cross section instead of the rounded one shown, the keys when once dropped into slots 43 cancan be effected.

' plate 52 and provided with a in the manner shown in Figs.

not Ibe removed fromr them any more by simply turning the fastener, and thus a permanent'lock It has been assumed in the above exempliflcations of the invention that the dish-like memberl is secured in holes I 2 or 32lby tight or forced fit. Instead, the position of the member may also besecured by welding or soldering, e. g., flange I5 or 4I to plate I0 or 30. In such a case the side walls I5 or 40 need not tightly nt the hole in the plate but may be slightly spaced from it.

- The dish-like member 'may also be riveted tol one ofthe plates, as'shown in Fig. 10, 10a, where the dish-like member comprises a springy center portion 39 with center hole 44 and slots 43, aside wall 40 somewhat spaced from hole 5I in plate 52, and a flange 49. Rivets 46 for securing the dish-like memberto plate 52 may either be fitted into corresponding bores of ange 49 and 53 as shown in Figs. `10 and 10d., or short rivets 41 may be inserted in bores of flange 49 only 11 andflla and soldered or welded at 48 to p1ate.52. The latter feature oners the advantage that no bores are to be .drilled'or punched into plate 52, and that the dish-like member can be conveniently soldered or welded onto plate 52 by choosing a material for,.rivets 41 which is weldable or solderable at relatively-low sheet metal of the dish-like \memb er may be such that it either cannot be welded or soldered at al1 or is detrimentally affected thereby,. particularly losing its springiness if high temperature h eatfor welding or soldering were to be applied -to itsilanges.

4used as exemplinedin Figs.

It is understood that instead of a simple drivet shown in Figs.'1 and "I, more rigid fits may be 12 and 13. `In. Fig. 12, decl in plate 53, and a springy center with atruna truncated hole 51 is'pro the dish-like member having portion ilandilange 55 is provided ,particularly in Fig.

like or cup shaped member I4 is provided with sides of dale 62 so that stud `2II can be driven into dale 52 from-both sides and not, as shown 4, only from lone side. Moreover,-the bottom of dale 62 issomewhat raised above the upper surface of the remaining center portion I9, wh'ereby.the elastic pressure by which i stud 23 is held in position under otherwise equal conditions is increased to any desired extent. In other words, if the grip ofthe fastener and the thickness of the plates Il), I I,.as well as the 'depth of the dish'ed' portion of member lfare the same, the elastic pressure by which plates I0, II are pressed one against the other and the, friction vbetween them` caused thereby will be' considerably larger with"the feature of the inventionillustrated in Figs. 14, 15 than with that according to Figs-1 to 4. Inversely, if the same pressure and friction is desired between plates III, II in the above two features of the invention, the grip of the 'fastener used in the feature according to Figs. ,14, 15' should be larger than in the feature according to Figs. 1 to 4.

counter-sunk head downwardly as shown in Figs. 1 to 4 and turned springy center f 63, 63, as wellas ,part of'center portion I4.

Referring to the'feature o f the invention illustrated' in Figs. 16, 17, it will be seen that the portion I4 is cut in along lines '66, B6, resulting in two flaps 64,

is slightly bent upwardly yIi5,is either slightly bent dotted lines in Fig. 17, or leftinv its position ush with the remaining Whenv the fastener the way described with reference to in'counter-clockwise direction, eventually studs 20 'arrive in the position shown inFigs. `16,

65, one of which,.,64 while the other one,

isinserted in of the upwardly bent nap 64 which acts as a stop,

n; in Fiss'.

while flap 55 is bent down in the in full lines `in Fig. 17 and-thereby causes desired elastic reactions in the flap. .Thus again the fastener is locked in the other. The fastenercan be removed by forcibly rotating it back in clock-wise direction until studs 2 3 register with slots 23.

It will be appreciated v 14, 15 can easily be manufactured simultaneously withpunchingand dishing memberll.l The same way,

as bending upwardly and downwardly, respective-4 which, upon driving the mem-y l cross section and wall 58` of the as illustrated' 14 and l5, the feature shown 17 and abut against the edge position shownits fastening position, and plates Il, -Il are resliently pressed one against v.

that the shallow dale,`

cutting in the .center portion I4 along lines 93,' 53 and A83. 36 as well ly, 'naps 84, 88 can be combined with and shaping member 18.

Referring to the feature of the invention shown in Figs. 18, 19, a fastener is shown there which consists of a preferably at head 81 with kerf I8 and solid bolt 68 provided with a bore 68 in which a pin 12 is tightly tted.

It should be understood that this type of fastener can equally be used withall lthe other features of the invention herein illustrated.

Plates 1814 are provided with holes 15, V18 of equal diameter which oiiers the advantage that4 the same plunger-or borer can be used for making` the holes and furthermore two or more plates can be piled up in alignment and punched bored simultaneously. Y

In each of the holes 15, 16 members .11, 18 are tightly fitted in any suitable way, particularly as previously described, and eachcomprises flanges 18, 88, sidewalls 8|, 82 and springy center porl tions 83, 84.

punching Member 11 on the inaccessible side of the joint is provided with a center hole 85 extending in slots 88 the same way as shown for similar members in the other features of the invention'.l The "'springy center portion 84 of member 18 is provided with a center hole 81 and is radially cutv in at 88 so that flaps 88 result. Shank 68 is provided with an annular groove 88 engaged by. the

projecting edges of flaps 88.

This joint is .assembled in the following inanner.- Before plates 13, 14 are positioned one on top of the other the dished members 411, 18 are driven or otherwise secured in hole 15, 1:8, respectively; shank 88 is pressed through hole 81 of member 18 whereby the flaps 88 yield`but, as soon as head 61 is aboutto contact center portion 84, jump into the angular groove 88; thereafter pin 12 is f 1'4 with member 84 and the fastener are ready for handling. It will driven into bore 88, and plat/e be appreciated that thus the plate with member 84 and fastener mounted therein can'be shipped, moved, etc., withoutjthedanger of losingjthe fastener or any part of it.

It will be further appreciated that this con-i v nection of the fastener with the dished member can also be used with otherfeatures of the lnventionv illustrated herein. i

Nowv plates 18 and 14 are alisne'fl, Din 12 being in such apositionthat itv can passv through the slots 88 ofv the other' member 11 whereupon a tooi is inserted iiitcjkerf is and the rastener turned in one orthe other direction. Thereby the springy center portions, 8 4 are deformed to desiredexte'n't en ,elastic reactions caused in them which secure iointof plates 18, '14.' Ill'o'rv simplicitys sake, -clales andvhills or other means shown in other illustrations of-the invention for preventing-pin 12 from Aunloclxingare not shown'. with respectto member plicablei' v It will bev further understoodfthat pin in. can" be made thinner endshank .u thirter.- ii-'inentbers 11 and 18, or either `oi'- theindished deeper.'

so that nopart vof the fastener projects beyond plate 18. Again-head." is'flat enough soia: not

to project beyond a plane laid through'. the icnverfT surface of flange 88.

It will also be understood that thepurposeof thein'vention is served if only center portions j of member 111s springy, while` center portion 84 is` not.- The joint is'accessible-from as to lock and'unlock thefastening.

Referring to the gesture `:nomi inrit. :ii-two sideline 11, butare-of 'cour-segg-,

an annular groove 88 engaged byv flaps 88 formed.

in the center portion 82 of a member 83 tightly tted with. its side wall 84 into hole 16 of plate 14. Hole in plate 18 is preferably of the same diameter as hole 18. A member 85 having a springy center portion 88 and beingiolded at 81 l0 to form a flange continued by wall 88, is inserted preferably with tight it into hole 15 and the lower edge |88 spun over to secure member 85 in place. The center portion 88 is again provided with a center hole |8I, and slots (not shown) 1,-, which permit shank 88 and Din 12 to pass.

Before assembling plates 18, 14, the members 83, 85 are mounted inthe holes 15, 1 8; shanlr 88 is passed through and securedin hole |82 formed by the inner ledges of flaps' 88 (as de- 0 scribed with reference to Figs. 18, 19)' and thereafter pin 12 driven into bore 68. Subsequently plates 18, 14 are posiitoned one upon the other, so that pin 12 arid shank 68 can pass through hole |8| and theslots of the center portion 86, and the fastener is then turned by about 90 in one direction or the other into the pos.tion shown in Fig. 20 whereby the lock is closed.. Center portion 88' and, if desired, center portion 82, are Sprinsy enough to cause elastic reactions therein when the fastener is in its locked position. Also i'n this case hills and dales or other means sel curing pin 12 in its locked position can be used as shown herein for other exempliflcations of the invention,

In the feature of the invention shown in Fig. 21, plates 18,14 are providedA with holes 15, 18, preferably of equal diameter. A member |88 is mounted in hole 15. e. g., by drive t and its center portion |84 provided with a countersunk '4u Dart |88 havinga hole |88 and slots (not shown). Member |81 is also tightly' fitted into hole 16 and provided with a springycenter portion |88 having a hole |88 and slots |18 extending to opposite sides, the same way as shown in the other 4f. figures. The fastener is provided with a sunk head I -tting into the eountersunk portion |85, and its shank ispreferably integral with the pojections'IiZ.- v s From the foregoing it will be understood that 18, 14 thereafter the latter assembled and the 'fastener p ut into position by passing studs H2 through the slots in the center portions |85, |88 and the shank through holes |88, |88, whereupon the'fastener is rotated vby means of an in- 'strument inserted in kerf |8fby about 90' in either direction and thereby the lock closed.

It is understood that the countersunk shape ofv m member |88 and the slightly .beveled -head III of invention herein shown', if it is on :the accessible outside of' the objects to-be Joined.

From the above itwill be realised that the in i vention substantially consists ln that the two objects. to be joined are provided with registering 'holes at least one of which is of considerably 'larger diameter than the shank of a fastener used. for Joining the objects, while the other' hole .is either oil slightly or consideiablylargerdiam- 18 eter .thanthe shank. In 'a -hole of considerably ber is secured either by tight nt. or other suitxable means, auch as soldering.' riveting, and provided with a center hole and slots ex-' ilrst the members |83, |81 are mounted in plates the4 fastenercan be 'used in other features of the largerdiameter a'dish-llke or cup shaped mem- 'Thev dish-like member comprises a springy cen- .ter portion, and the grip of the fastener' is such that after it has been turned into locking position,lthe .center portion lof a dish-like member is deformed to desired-extent and thereby elastic reactions are caused therein which serve to press the objects to be with those in the member mounted in the other object, so that the shank with' its projections can be passed therethrough. If the diameter of the hole in the other object is also considerably when the objects are joined, atleast one of said holes beingof considerably larger diameter than '7 the shank of a fastener used for joining the objoined one against the.. other. If the diameter vofthe hole in one of the" objects is only slightly larger than that of the" shank, the hole. extends into slots registering larger than the diameter of the shank, another. preferably dish-like or cup shaped member is I mounted in it and provided with a hole and slots to permit the shank with itsqprojections to pass. It is immaterial for the principles of the invention whether the head of the fastener is resting on a rigid or more elastic part. It' is further immaterial for the principles of the inventionwhether the head ofthe fastener is button-like, fiat or sunk, or whether the fastener consists of oneor two pieces as illustrated.

It is essential 'for the invention that at least one member is provided which is springy at least in its center portion, thereby securing the joint,

and which can easily be made and shaped in mass production and equally easily mounted in a hole of 'one of the objects to be joined, and that such ,--hole .is also easily produced by punching, drilling,

etc. Thereby the inventionadvantageously differs from' other fastenings comprisedo'f vmore complicated shapes of the cooperating members which also project beyondaccessible sides of the joint exposed to airand thereby, if used for aircraftand other vehicles, increase the air resist.-`

ance. 'I'hese and other 'advantages of the invention. are to be realised from the foregoing exemplifications of the invention which is howevernot limited to them but to be derived in its broadest aspects from the appended c1aims. A

WhatI claim is: 'j 1. A fastening for joining at least two objects,

such as plates or sheets, provided with aligned holes at Athe place wherethe fastening `is to be applied and at least one of the holes having a jects, comprising a member which is springy at A the place to be gripped by the fastener and outside said place engages and is mounted in a hole of said larger diameter, said memberprovided at said spring'y place with a hole and slots communicating therewith and'extending to oppositel sides, a fastener comprising a head and shank and projections nearv the freeend of saidshank, said hank and projections adapted to pass respecl tively through said hole and slots, the hole in the other object being shaped so as to'permit only said shank and projections tov pass therethrough,. so that said fastener when passed from the accessible side of the objects with its shank and projections through said aligned holes and slots and turned for a predetermined minimum angle joins said objects, lthe grip of said fastener defined by the distance of adjacent surface portions of said projections and head being such that resilient reactions are caused in the springy place of said member in said joining position of the fastener, and means associated with said member forlocking at least temporarily said projections in their joining position. 3. A fastening. for joining at least two objects, such as plates or sheets, provided with aligned holes at the place where the fastening is to be applied and at least one ofthe holes having a considerably larger diameter thanI the shank of l the fastener tovbe applied, comprising a unitary dish-like member having a springs' tenter portion and flange, said member mounted in a hole of said larger diameter and said flange resting upon a portion of said object close to said hole, said' center portion provided with a hole and slots communicating therewith land extending to opposite considerably larger diameter, thanthe shank of the fastener to be 'applied, comprising a member which is springy at the place tob` gripped' by the v fastener and adapted to be mounted outside said l `place in a hole of said larger diameter, saidin'em` ber provided at said springy place` with a hole' and slots communicating therewith and extend ing to opposite sides. a fastener comprising ahead and shank and projections near the free end of said shank, said shank and projectlonsadapted to pass respectively through said hole and slotsthe hole in lthe other object 'being shaped so as to permit only said shank and projections topass. therethrough,` so that saidv fastener when 'passed with its shank and lprojections through saidholes at the placerwhere .said shank andprojections center portion sides, a fastener comprising a head and shank and projections near the free end of said shank, said shank and projections adapted to pass re`- spectively through said hole and slots, the hole in the other object being shaped so as to'pernt only to pass therethrough, so that said fastener when passed with its shank and projections throughsaid aligned h olesand `.s1ots and turned for a predetermined minimum angle joins said .objects, and the grip of `said thedistance of adjacent sur#- sucht thatresilient reactions are caused in said in said joining position vo f the fastener.V i 1 r 4. A fastening for joining at least two objects, such 'as plates or sheets,'provided with aligned the fastening is; to be applied andat 'least oneof the holes having 'a aligned hplesand slots andturned for'a predetermined minimum'angle joins said objects, and

the grip of said fastener defined by the distance of adjacent Asurface portions of itsprojections and he'ad 'being such thatresilientreactions are .caused in the vspringy portion of said member in u said joining position of the fastener.

2. A fastening for joining at least two objects,

.such as plates orv sheets. accessible from one side y only and provided with holes. being in alignment 'thefastener to be applied,

, center portion arrang considerably larger diameter than the shank of v comprising a. unitary v.dish-likemember of sheet material having a and a sidewall, the dishes springy center portion larger diameter and said sidewall fltted into said hole, said center portion provided with-a hole and slots communicating therewith and extendingto opposite sides, 'shank and. projections near the free end of said .a fastener .comprising a head andv shank, said shank and projections adaptedvto'pass respectively through said hole and slots; the hole in the other object only said shankA and projections to' passthere-fy -through, so that saidfastener when passed with.-

it shank and projections through said aligned ples and slots and .turned fora predetermined within a hle 0f said being shaped so as to permit minimum angle yjoins said objects, and the grip of said fastener defined by the distance ofadjacent surface portions 'of its projections and head being suchthat resilient reactions are caused in said center portion in said joining position'of the fastener.

5. A fastening for joining at leasttwo objects, such as plates or sheets, comprising a fastener substantially consisting of a head and shank and projections near the free end of said shank extending to opposite sides, each of said objects being lfabricated to permit said shank and projections only to pass through said objects, by each object being provided with a hole and slots communicating therewith and extending to opposite sides so as topermit said shank and pro jections to pass therethrough, at least one of said holes and its slots being arranged in a member which is springy adjacent to said hole and its slots and which is mounted in ahole in one of said objects, of larger size than that of the hole and slots in said member, so that said fastener when passed with its shank and projections through the aligned holes and slots provided in said objects, and ,turned by a predetermined minimum angle joins said objects, and the grip of said fastener defined by the distance of adjacent surface portions of its projections and head being smaller than the initial distance between the' surface portions to be contacted respectively by the head and projections of the fastener, so that the fastener in its joining position causes resilient reactions in the sprinsy portion of said member. t

6. A fastening for joining at least two objects,

.such as plates or sheets, comprising a fastener to pass therethrough, at least one of said holes and its slots being arranged in a member which is springy adjacent to said hole and its slots and which is mounted in'a hole in one of said objects, of larger size than that ofthe hole and slots in said member, so that said fastener when passed v with its\shank and projections through the aligned holesl and 4slots provided. in said objects and turned by a predetermined minimum angle joins said objects, the grip of said fastener wdefined by the distance of adjacent-surface portions of its projections and head being smaller than the initial distance between the surface portions to be contacted respectively by the head and projections of the fastener, so that the fastener in -its joining position causes resilient reactions in .60 l

'- o joining position.

the springy'portion' of said member, and means for,i locking at least temporarily said projections in their joining position. f

7. A fastening vfor joining at least two objects',

- such as plates or sheets, comprising a ,fastener substantially consisting of a head and shank and .projections near the free end 'of said shank extending to opposite sides, sleeves on said projections, each ofv said objects being -fabricated to permit said shank and projections only 'to pass through said objects, by each object being provided witha hole and slots communicating therewith and extending to opposite sides so` as to e permit said shank and projections to pass therethrough, at least one of said holesand its slots being arranged in' a unitary dish-like member' which is springy adjacent to said hole and its slots and which is mounted in a. hole in one of said objects, of larger size than that of the hole 5 and slots in said member, so that said dish-like portion is sunk into said hole and said fastener when passed with its shank and Projections `through the aligned holes and slotsv provided in said objects and turned by a predetermined minimum angle Ijoins'said objects-and the grip of said fastener defined iby the distance of adjacent surface portions of its projections and head being smaller than the initial distance between the surface portions to be contacted respectively by l5 the head and projections of the fastener, so that the fastener in its joining position causes resilienit reactions in the springy portion of said f member. 1

8. A fastening for joining at least two objects, l0 such asfplates 'or sheets, comprising a fastener substantially consisting of a head and shank and lprojections near the free end oiiand.r integral with said shank and extending to opposite sides, each ofsaid objects being fabricated to permit 2J said shank and projections only to pass through said objects, by each object being provided with a hole and slots communicating therewith and extending to opposite sides so as to permit said shank and projections to pass therethrough, at 1east one of said holes and its slots being arranged in a member which is springy adjacent to said hole and its slots and which is, mounted in a hole in one of said objects, of larger size than that of the hole and slots in said member, so that said fastener when DaSSed with its shank and projections through the aligned holes and slots provided in said objects, and turned by a predetermined minimum angle joins said objects, and the grip of said fastener dened by 40 the distance of adjacent surface portions of its projections and head .being smaller than the initial distance -between the surface portions to be contacted respectively by the head and projections of the fastener, so that the fastener in its joining position causes resilient reactions in the springy DOrtion of said member,

9. In a fastening as described in claim 6, said means for at least temporarily locking said projections in vtheir joining position consisting in abutments, as exemplied by hills, associated with the springy portion of saidy member and arranged at least oni'one side of each projection in their joining position.

t l0. In a fastening as described in claim 6, said means for at least temporarily locking said projections in their joining/position consisting in hills, as`exemplified by a key', associated with the inside of-said headv and arranged to engage the slots through which said projectionsvhave been passed after said fastener has been turned into its therewithand extending to opposite sides, permitting'said shank and'pro-jections to pass therethrough, said member mounted outside said center portioninm, 'hole of corresponding size in the inaccessible one of the objects tc te joined,

providedwitha hole and slots communicating- ,v slots communicating .therewith and opposite sides. so as to permit said .jections to pass therethrough, the ing springy adjacent'to said hole and slots and the hole in the other object ,being shaped so as to permit only said shank and projections to pass therethrough, vso that said fastener when passed from the accessibleside of theA objectsy with its shank and projections respectively through said turned into its joining position. 1

12. A fastening for joining at least two objects, such as plates or sheets, accessible from one side onlyancll provided with holes in alignment when I fastener joins said objects, and the grip .oflsaid fastener defined by the distance of adjacent surface portions of its projections and head being smaller than the initial distance between Ithe surface portions of the two discs to be contacted respectively by the head and projections of the fastener, the fastener in its joining position causes resilient reactions in the springy portion of said latter disc. 'l

14.. A fastening for joining at least two objects,

@such as plates or sheets, provided with holes the objects are joined, comprising a fastener sub stantially consisting of a head andshank and projections near the free end of said shank and extending to opposite sides thereof, .a dish-like. member having a springy center portion provided witha hole and slots communicating therewith and extending to opposite sides 'permitting said shank and projections to ,pass therethrough, said member mounted outside said center portion in a hole.of corresponding size in the accessible one of the objects, .so that its dish-like portion is -sunk into said hole, saiddish-like portion shaped and of a size to receive the head of said fastener, said head being shaped so as not to protrude beyonda plane laid through the accessible outside surface of said object or member mounted in Saidl object, the hole in the other Object being shaped so as to' permit only said shanlrand4 projections to pass therethrough, so that .said

fastener when passed from the accessible side ofthe objects with its shank and projections respectively through saidaligned holes and slots and turned by a .predetermined minimum angle joins said objects, andthegrip of, said fastener defined 'by the distance' of adjacent'surface portionsofsaid projections'and head beingsmaller than the initial distanceV between the surfaces ycons'istingof a head, shank and which areI aligned when the bodies are joined, substantially comprising a fastener essentially projections near the free end of said shank and extending to opposite sides thereof, and a unitary dish-like member having a flange and a springy center portion provided with a hole and slots communicating therewith and extending to opposite sides permitting said shank and projections to pass therethrough, said member mounted, outside said center portion, in one. of said holes in the objects to be joined so that its flange rests on the object outside said hole, so that when said fastener isl passedv with its shank through the other hole in the objects to be joinedfand its shank and projections through the hole andslots in the saidv member, and is turned for a predetermined minimum angle, it joins said objects, the said projections exerting pressure on one of said objects, and the said headV exerting pressure on the other object, and the grip-of said fastener defined by the adjacent surface portions of its projections. and head is such that' resilient reactions are caused in the springy portion of said member in said joining position of the fastener. v

15. A fastening for joining two objects, such as f plates or sheets, provided with holes which are of said vmember and object to be contacted respectivelyby said head and projections. so that,

resilient reactions are caused in s aid springy'portion when the fastener is turned intov its joining position.

1a. A fastening for joining at ioasttwo ob` jects, such as plates or sheets, comprising a fastener substantially. consisting of a head, a shank and projections removably mounted near -the free end of said 'shank extending to opposite 'sides thereof, said shank being provided with a recess, .a disc mounted inl each of said objects one of said .discs having a hole so as to permitsaid shank to passtherethrough, the'projections'being removed therefrom, and the other disc having a hole and mounted ina-hole of oneof said objectsof larger size modulator .trie 'holeond slots irl-said latter disc, thejedge'about 'the hole of the former disc being axially resilient as exemplified by aps' aligned when the bodies are joined, substantially comprising a fastener essentially consisting of a head, shank and projections knear -the free end of said shank and extending to opposite sides thereof, said projections lbeing formed by protruding parts of a pin tightly tted within a hole of 'said shank near its Afree end, and a unitary 4disk-likemember having a flange and ayspringy center portion provided with a hole and slots communicating therewith and extending to' opposite sides permitting said shank'and projections .to pass therethrough, said member mounted. outside said center portion, in one of said holes in j `the objects to be joined, so thatfthe flange rests'- on the object outside said h ole, so that when saidfastener is passed with its shank through the lin the said-member, and is turnedfor a prede'- other hole in the objects to be joined, andas shank andprojections throughthe hole and slots termined minimum angle, it-joins said objects,

fthe said .project-ions exerting pressure o n one of .60 extending toi, l shank and provv f latter disc besaid objects; and thesaid-head exerting pressure on the` other object, and the `grip of said fastener defined` by the' adjacent' surface portionsV of its projections and 'head is A such that-resilient reac' [tions are caused `in the springy portion of said formedby radially slitting said edge. so that when said fastener is passedwith its shank through'- the hole in .s'aid former disc said resilient edge engages said'recess and when said .fastener is f passed wi'th'its shankl and projections through .the slots and hole formed in the latter disc an'dl turned by a predetermined angle, 'the memberin said-joining position of the fastener. 16. A fastening for joining two objects, such as plates or sheetyprovided'with holeswhich are aligned whenthe bodies'are joined, substantially comprising' a fastener essentially`v consisting of a truncated, Acountersunk head, shankand provjectionsfnear the free end of said shankY and extending. to opposite sides thereof, and 'aunitary disk-like member having a. springy center portion provided witha hole and slots, communieating' therewithand7 extending to opposite sides permitting saidv shank therethrough, said member mounted, outside to be joined, of corresponding size in the accessible side yof the objects and provided vwith rims projecting beyond the circumference of said hole and resting on the accessible surface of the ob ject, the springy portion of saidmember sunk it is mounted and shaped into said hole in which to receive said eountersunk head, so that when the hole and slots in the said member,'and is turned for a predetermined minimum angle, it

vjoins the objects, the said projections exerting pressure on one of said objects, and the said head exerting pressure on the other object, and the grip of said fastener defined by the adjacent sur' face portions of its projections and head is such tions to pass therethrough, said member mounted, outside said center portion, in one of said holes in the objects to be joined, 'of larger size than that ofthe hole said member being provided with a rim projecting beyond the circumference of the hole in which it is mounted, said rim beingo seclred to the object by permanent means,l such as a weld, a soldered seani,'or rivets, so that when said fastener is passed with its shank through lthe other hole in the objectstobe member, andis turned for a predetermined minimum angle, it joins said objects, the said projections exerting pressure on one of said objects and the said head exerting pressure on the other object, and the grip of said fastener defined by the adjacent surface portions of its projections and headj is such that resilient reactions are caused in the springy portion of said member in said joining position of thefastener.

18.` A fastening for joining two objects, such as plates .or sheets, provided with holeswhich are aligned when the bodies ,are joined, substantially comprising afastener essentially consisting of a head, shank and projections near the free end of said shank and extending to opposite sides thereof, and `a unitary disk-like member having a the free end of f and slots in said member,

joined/and its shank and projections through the .hole and slots'in the said center portion, in oneof said holes in the objects said fastener is passed with its shank through ing, so that when said aeravsaaA and projections to pass' springy nter portion provided with a hole and slots communicating therewith and extending to opposite sides permitting said shank and projections to pass therethrough, said member mounted. outside said center portion, in'one of said holes in the objects to be joined, of larger size than that of the hole and slots in said member, said member beingwprovided with a rim projecting 4beyond the circumference of the holelin which it is mounted. said rim being provided with rivets of a material attachable to the object, as by welding or solderfastener is passed with its shank through the other hole in the objects to be joined, and its shank and projections'through the hole and slots in the said member, and is turned for a predetermined minimum angle, it joins said objects, the said projections exerting pressure on one of said objects, and the said head exerting pressure on-the other object, and the grip of said fastener defined by the adjacent surface portions of its projectionsl and head is such that resilient reactions are caused in the springy portionof said member in said joining position of thefastener.

19. A fastening for joining two objects, such es plates or sheets, provided with. holes which are aligned when the bodies are joined, substantially comprising a fastener essentially consisting oi a head, shank and projections near the free end of said shank and extending to opposite sides thereof, and a. unitary disk-like member having a springy center portion provided with a hole and slots communicating therewith and extending to opposite sides permitting'said shank and projections to pass therethrough, said member mounted, outside said center portion, in one of said holes in the objects to be joined, of larger size than that of the hole and slots in said member, said member being provided with a rim projectingbeyond the circumference of the hole in which it is mounted, and a side wall, said rim resting aon one side of the object and said side w-all arranged in the hole in which the member is mounted and having an edge spun over the that when' said fastener is passed with its shank through the other hole in the objects tolbe joined,

other side of said object, so

and its shank and. projections through the hole and slots in the said member, .and is turned for a v predetermined minimum angle, it joins said objects, the said projections exerting pressure on rone ,of lsaid objects, and the said head exerting pressure on the other object, and the grip of said fastenerdeflned by the adjacent surface portions of its projections and Head is such that resilient reactions are caused in the springy portion of said member in said joining position'of the fasi'fener.

FRITZ voN OPEL. 

